US8172117B2 - Stable backpack - Google Patents

Stable backpack Download PDF

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Publication number
US8172117B2
US8172117B2 US13/254,351 US201013254351A US8172117B2 US 8172117 B2 US8172117 B2 US 8172117B2 US 201013254351 A US201013254351 A US 201013254351A US 8172117 B2 US8172117 B2 US 8172117B2
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United States
Prior art keywords
shoulder
hip
bar
cord
attached
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US13/254,351
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US20120000948A1 (en
Inventor
Gregory Maggi
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C&P Hiam Associates LLC
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Priority to US13/254,351 priority Critical patent/US8172117B2/en
Assigned to C & P HIAM ASSOCIATES LLC reassignment C & P HIAM ASSOCIATES LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAGGI, GREGORY
Publication of US20120000948A1 publication Critical patent/US20120000948A1/en
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Assigned to MAGGI, GREGORY reassignment MAGGI, GREGORY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: C AND P HIAM ASSOCIATES LLC
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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F3/00—Travelling or camp articles; Sacks or packs carried on the body
    • A45F3/04—Sacks or packs carried on the body by means of two straps passing over the two shoulders
    • A45F3/047—Sacks or packs carried on the body by means of two straps passing over the two shoulders with adjustable fastenings for the shoulder straps or waist belts
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F3/00—Travelling or camp articles; Sacks or packs carried on the body
    • A45F3/04—Sacks or packs carried on the body by means of two straps passing over the two shoulders
    • A45F3/08—Carrying-frames; Frames combined with sacks
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F3/00—Travelling or camp articles; Sacks or packs carried on the body
    • A45F3/04—Sacks or packs carried on the body by means of two straps passing over the two shoulders
    • A45F2003/045—Sacks or packs carried on the body by means of two straps passing over the two shoulders and one additional strap around the waist

Definitions

  • a backpack is a means for a person to carry a load.
  • FIG. 1 illustrates a backpack referred to in U.S. Pat. No. 4,676,418, entitled “Backpack Having Improved Load Distribution and Stabilizing Structures”, by Greg E. Lowe (Lowe).
  • a person has a backpack 100 mounted on his back.
  • the backpack comprises a flexible sack 102 and a sheet frame 104 .
  • a shoulder harness 106 and a hip harness 108 are provided to mount the pack on the person.
  • the shoulder harness is designed to keep the pack at a fixed position and orientation relative to the person's shoulders.
  • Lift straps 112 are provided to help the person adjust the relative weight distribution between the shoulder harness and the hip harness.
  • FIGS. 2A and 2B illustrates a backpack suspension referred to in U.S. Pat. No. 5,184,764, entitled “Load Support” by Orovan et al. (Orovan).
  • a hip harness 202 is affixed to a pack frame (not shown) by a mounting plate 204 .
  • a shoulder harness 206 is affixed to the hip harness by a slideable webbing means 208 . This allows the person wearing the pack to raise and lower his or her arms.
  • the right arm 200 is up, the right shoulder pad goes up.
  • the webbing 212 slides through a buckle and the left shoulder pad goes up.
  • the features in the aforementioned back packs are described as suitable for walking or other relatively slow motions carried out by a person wearing a backpack. Hence they are suitable for gaits that merely require freedom of movement. They do not, however, take into account the requirements of a person engaged in relatively rapid gait, such as running.
  • the requirements of running differ from walking due the fact that inertia and elastic energy recovery in the oscillating and twisting motions of the runner are important.
  • a person is bouncing up and down and twisting from side to side as he or she runs.
  • Running efficiently with a pack with substantial weight in it therefore, requires that the pack be able to respond to the up and down and twisting body movements of the runner without causing undue discomfort or energy loss.
  • the pack must be able to adapt to the changing stance and movements that a person goes through as he or she transitions from walking to running and vice versa.
  • FIGS. 3A and 3B illustrate the different harness requirements of a walking person 300 and a running person 330 .
  • Each person is carrying a backpack 302 with a significant weight load 314 .
  • the backpack shown is an embodiment of the invention(s) described herein.
  • the person carrying the pack may be referred to herein as a “wearer” or “runner”.
  • open headed arrows indicate motion or direction. Closed head arrows point to particular items.
  • the person 300 in FIG. 3A is walking at a speed of about 3.2 km/h.
  • the shoulder harness is adapted to allow free motion of the arms 324 .
  • This adaptation comprises cables and pulleys which allow the lower portions of the shoulder straps 326 to lengthen and shorten as the person walks.
  • Cable and pulley means 328 are also provided to bring the pack close 312 to the person's torso so that the center of mass of the load 314 is as close to being over the hip joints 316 as possible. Keeping the center of mass of the load close to the hips minimizes the torque that would otherwise pull the person's torso backwards.
  • center of mass of a load generally refers to where the center of mass would be if the pack were loaded with a uniform density load.
  • Vertical support bars mounted on pivots 329 are also provided to allow alternating vertical hip motion without causing undue twisting of the pack.
  • FIG. 3B illustrates the same person 330 with the same pack running at a speed of about 9.6 km/h. Relative to walking, the person is bent forward 332 at the waist. His arms and shoulders are swinging back and forth both rapidly and with large amplitude 334 . His entire body is moving up and down 336 as the person alternately leaps from his right foot to his left foot and back again.
  • the shoulder harness now acts as an active suspension by providing constant and balanced horizontal forces 342 , 344 at the shoulders. This allows the shoulders to move in twisting motions without causing undue twisting motions in the pack.
  • the hip harness also now acts as an active suspension by providing balanced vertical forces 346 on the person's hips as said hips go through their respective twisting motions.
  • the shoulder harness and hip harness act in concert to keep the pack close to the person's body despite the increased lean forward.
  • FIG. 1 is a backpack referred to in U.S. Pat. No. 4,676,418
  • FIGS. 2A and 2B are of a backpack referred to in U.S. Pat. No. 5,184,764
  • FIGS. 3A and 3B compare the requirements of a pack on a walking versus a running person.
  • FIG. 4 illustrates an embodiment of a shoulder harness.
  • FIG. 5 illustrates an embodiment of a hip harness.
  • FIGS. 6A and 6B illustrate a person wearing an embodiment of a combined shoulder and hip harness while running at 9.6 km/h and carrying a load of 13.6 kg.
  • FIG. 7A illustrates an alternative embodiment of a shoulder harness.
  • FIG. 7B illustrates an alternative means of slideable cord attachment.
  • FIG. 8 illustrates an alternative embodiment of a hip harness.
  • FIG. 9 illustrates an alternative embodiment of a hip harness.
  • FIG. 4 illustrates an embodiment of a shoulder harness that is suitable for both walking and running.
  • Three dimensional axes 401 are shown to help facilitate discussion of movement of the pack as a person runs.
  • the axes include x, y and z axes.
  • a fabric container 400 is mounted on a sheet frame 406 using sleeve 409 and cap 408 . Padding may be provided on the sleeve for wearer comfort.
  • a shoulder harness is generally shown as item 402 .
  • a hip harness 404 is generically shown as item 404 . The details of the hip harness will be presented in FIG. 5 .
  • Other types of containers, such as rigid containers, are also suitable.
  • Other sorts of frames, such as tubing or bar-based frames, are also suitable.
  • Frame materials can be metal, plastic, carbon fiber composite or other stiff, strong and lightweight material.
  • the shoulder harness comprises padded shoulder straps 412 .
  • Said shoulder straps are fixed to the sheet frame by pivot means 414 . They may also be fixedly attached.
  • the lower portion of a shoulder pad is attached to a piece of adjustable length webbing 444 .
  • Said webbing is attached to a lower hip cord 442 . 3 mm diameter nylon cord is suitable.
  • the lower hip cord passes through a lower hip cord pulley 446 . It then proceeds behind the sheet frame to a corresponding lower hip cord pulley 447 on the other side of the pack.
  • the lower hip cord then proceeds to a corresponding adjustable length webbing 449 attached to the other shoulder strap.
  • the lower hip cord is free to move as the shoulder pads alternately move up and down.
  • the lower hip cord pulleys are attached to the opposite ends of a lower hip cord pulley spacer bar 448 each with a short piece of flexible webbing 451 .
  • the ends of said lower hip cord pulley spacer bar are attached to the fabric of the container.
  • the pulleys are free to change their orientation in response to movements of the straps and chords, but are maintained at fixed locations at the bottom corners of the container.
  • the chords provide relatively fixed and balanced vertical forces 454 , 456 on each side of the bottom of the pack. These forces have relatively constant components in the z and x directions and minimal components in the y directions. This helps the pack maintain a relatively stable rotational orientation with respect to the x, y and z-axis as the runner moves beneath it. This increases comfort and reduces energy loss in the runner.
  • Suitable pulleys are ball bearing pulleys with very low stiction (i.e. start up friction) so that the cord will move freely therein with minimal hysteresis even with a heavy pack load and small amounts of motion. 1.27 cm diameter pulleys used in the construction of sail wings are suitable. AustriAlpin pulleys are suitable.
  • the lower hip cord pulley spacer bar 448 should be stiff and light. A 3.2 cm wide by 1.6 mm thick aluminum bar 30.5 cm long is suitable. The bar should be oriented so that the lower hip cord passes between it and the sheet frame and moved freely.
  • the tops of the shoulder straps are attached to adjustable length webbing 424 .
  • the webbing in turn, is connected to upper shoulder cord 422 .
  • the upper shoulder cord passes through upper shoulder cord pulleys 426 , 428 .
  • the upper shoulder cord pulleys may be attached directly to the fabric of the container each using a short length of flexible webbing 432 . Since attachment points of the pulleys are close to the top of the sheet frame, the sheet frame keeps the pulleys apart 433 .
  • the upper shoulder cord pulleys should be positioned at about the maximum height of the shoulder straps 460 when the shoulder pads are in a bowed configuration such as they might take when a person is wearing the pack. This corresponds to the about shoulder height of the wearer.
  • constant and balanced horizontal forces 434 and 436 are provided to the top of the pack as the tops of the shoulder pads move due to the twisting motions of the runner. The constant and balanced horizontal forces keep the top of the pack close to the runner without causing undue z-axis twisting.
  • FIG. 5 illustrates an embodiment of a hip harness. Reference x, y and z axes 501 are also shown.
  • the fabric container is item 500 .
  • the shoulder harness of FIG. 4 is shown generically as item 502 .
  • the hip harness is generally indicated by item 504 .
  • the hip harness comprises a padded hip belt 512 attached to adjustable length fabric webbing 514 . Said webbing is joined together with a buckle 516 . Other closure means may be used. Split strap webbing 517 may alternatively be provided. Split strap webbing can have a more comfortable and secure fit than single strap webbing since each strap is individually adjustable in length.
  • the padded hip belt is attached to a curved spring hip bar 524 via pivot attachments 522 .
  • the pivot attachments may comprise ball bearings to minimize stiction.
  • the attachments are located at about the major axis 554 of the oval formed by the hip belt when the hip belt is buckled. These points correspond to the hip joints of a wearer.
  • the spring hip bar is pivotally attached to the sheet frame at about the center line 526 of said frame. Ball bearings may be used in the pivot joint.
  • the hip belt is free to pivot about the x axis and y axis.
  • the pack can stay close to a wearer's back as said wearer transitions from an upright walking pose to a forward bent running pose.
  • the spring hip bar should be flexible enough to be deformed about the z axis so that a wearer can pull the hip belt closed when putting on the pack. It should be stiff enough to hold its shape in the xy plane, however, as the wearer moves with a loaded pack.
  • a bar of suitable stiffness is 3.2 cm wide by 4.7 mm thick polypropylene.
  • a suitable length of the spring hip bar is 55.8 cm.
  • the spring hip bar's relaxed shape should be an open curve wider than a person's hips so that it will open up when the buckle is opened and thus the hip belt can be put on and removed easily.
  • the spring hip bar will help the pack maintain a relatively constant height as a wearer bounces up and down beneath it due to the bar's flexing in response to said bouncing.
  • the hip harness additionally comprises vertical support rods 532 .
  • the support rods can have a strength and flexibility comparable to that of ski poles.
  • the materials of construction may be lightweight materials such as aluminum, fiber glass or graphite composite.
  • the configuration can be straight tubing or tapered tubing with round, triangular or other cross section.
  • the support rods are attached to the hip spring bar at pivot points 522 located at about said major axis of the hip belt when the hip belt is closed.
  • a suitable pivot attachment means 534 is a ball-and-socket joint, such as a Heim joint.
  • the ball-and-socket joint allows the support bars to rotate outwardly when the hip belt buckle 516 is unsnapped and the spring hip bar expands to its relaxed form.
  • the vertical support rods 630 are curved near the bottom and relatively straight near the top so that they extend inwardly and upward along the side of the container 602 in order to provide clearance for the wearer's arms. They also provide a space between themselves and the hip belt for the lower hip cord 632 to pass freely inside. The curvature of the rods should be gradual enough so that the vertical support rods will not hit the lower hip cord 632 as the rods move up and down 634 while a wearer walks or runs.
  • the tops of the vertical support rods are joined to a horizontal pivot shoulder bar 538 .
  • Said joint may be a ball and socket joint 542 .
  • a suitable length for the vertical support rods is 45 cm.
  • the length of the vertical support rods can be in the range of 35 to 55 cm, depending upon the torso length of the wearer. Taller wearers would have longer vertical support rods.
  • the horizontal pivot shoulder bar proceeds through a horizontal pivot shoulder bar channel 544 behind the sheet frame.
  • the shoulder bar is long enough so that its ends extend beyond the sides of the sheet frame when the bar is in the channel.
  • a suitable dimension for the horizontal pivot shoulder bar is 2.5 cm wide by 30.5 cm long by 3.2 mm thick.
  • the shoulder bar can also be wider at the center and tapir towards its ends.
  • a suitable material for the shoulder bar is aluminum or other similarly strong and lightweight material.
  • a suitable dimension for the channel is 7 to 12 cm wide by 25 cm long by 8 to 20 mm deep.
  • the channel may also have a butterfly configuration where it is narrow in the center and expanded at the ends. Thus the bar is fee to move about the pivot point 546 and minimal pack volume is sacrificed for the channel.
  • the back of the channel 545 may also extend to cover the end of the shoulder bar so that the end of the shoulder bar will not catch on the fabric of the container behind it as it moves up and down.
  • the horizontal pivot shoulder bar is pivotally joined 546 to the sheet frame at the midline of the sheet frame. This corresponds to about the center point of the wearer's shoulder blades. This is also about the same level as the attachment points of the shoulder straps (item 414 , FIG. 4 ).
  • the net effect of the support rod configuration is that a substantial fraction of the load supported by the hip belt is transmitted 548 to the sheet frame at a high location. This location will be above the center of mass 552 of the load in the pack for most pack loadings. This will help stabilize the pack about the x axis as the wearer's hips oscillate about both the x and z axis as the wearer runs. Even if the pack is loaded so that the center of mass is above the pivot attachment point 546 , the high position of the attachment point will minimize the tendency of the pack to oscillate.
  • the hip harness may additionally comprise a pair of lower stabilizing straps 572 .
  • Each strap is attached to a pivot point 522 on the spring hip bar and may be adjustable in length.
  • One end of each strap is attached to a lower stabilizing strap pulley 568 .
  • a lower stabilizing strap chord 562 passes through each pulley.
  • One end of each chord is attached near the back of the container at a mid level 564 .
  • the other end is attached at a level 566 vertically lower relative to mid level 564 .
  • the lower stabilizing strap cords may also be attached to adjustable length webbings which, in turn are attached to the container. Thus the effective length of the cords can be adjustable.
  • the stabilizing straps serve to help keep the load of the pack close to the runner with a force that is relatively independent of the bending of the runner at his/her waist. This can be important in rough terrain where a runner will have to constantly adjust his or her bend at the waist.
  • FIGS. 6A and 6B illustrate two strides of a runner 600 , 601 wearing a pack 602 , 604 with a combined shoulder harness and hip harness as described above.
  • the pack was loaded with 13.6 kg of ballast with a center of mass below the runner's shoulder blades and below the horizontal pivot shoulder bar.
  • the runner ran on a treadmill at a speed of 8 to 9.6 km/h.
  • the running was filmed.
  • the attachment points of the hip and shoulder harness to the frame and container of the pack should be selected to minimize twisting and bouncing of the back while the wearer is in motion.
  • the attachment point 610 of the horizontal pivot shoulder bar channel to the frame should be below the attachment points 612 of the upper shoulder cord pulleys to the container. This will allow free alternating horizontal movement of the upper shoulder chord as well as free vertical pivoting motion of the horizontal pivot shoulder bar while maintaining relatively constant forces on the pack.
  • the attachment point 620 of the lower hip cord pulley spacer bar to the container should be behind the frame and above the attachment point of the horizontal spring hip bar to the frame. This will allow free horizontal movement of the lower shoulder cord between the lower shoulder cord pulleys as well as free vertical pivoting motion of the horizontal spring hip bar while also maintaining relatively constant forces on the pack. The relative distribution of these forces can be adjusted using the adjustable webbing and straps as described above.
  • FIG. 7A illustrates an alternative embodiment of a shoulder harness 700 where an upper shoulder cord 702 is attached to the top of each shoulder strap 703 .
  • the shoulder cords pass through an upper shoulder cord pulleys 704 and then proceed down to the ends of a horizontal hip pivot bar 706 where they are attached 708 .
  • a lower shoulder cord 710 attaches the bottom of each shoulder strap 712 to the horizontal hip pivot bar.
  • the slower shoulder cord may comprise adjustable length webbing 713 or consist entirely of adjustable length webbing. Both shoulder straps have the same set up.
  • the horizontal hip pivot bar is attached to the sheet frame at pivot point 714 .
  • FIG. 7B illustrates an alternative embodiment of a slideable cord attachment 710 that comprises a loop of low friction material such as Teflon®.
  • Alternative shoulder harnesses may be employed such that constant forces are applied to the pack from the shoulders even when the shoulders move with respect to each other.
  • FIG. 8 illustrates an alternative embodiment of a hip harness 800 that comprises a reinforced spring bar 802 and large pivot attachment 804 such that supporting rods are not required.
  • FIG. 9 illustrates an alternative embodiment of a hip harness 900 which comprises gearing 902 which allows twisting movement 904 of the hip belt.

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Application Number Priority Date Filing Date Title
US25713009P 2009-11-02 2009-11-02
US13/254,351 US8172117B2 (en) 2009-11-02 2010-11-02 Stable backpack
PCT/US2010/055088 WO2011053961A2 (fr) 2009-11-02 2010-11-02 Sac à dos stable

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US20120000948A1 US20120000948A1 (en) 2012-01-05
US8172117B2 true US8172117B2 (en) 2012-05-08

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EP (1) EP2496112B1 (fr)
CA (1) CA2785135C (fr)
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US20140074003A1 (en) * 2012-09-13 2014-03-13 Nancy Monden Posture and Lifting Orthotic
US8941777B1 (en) 2012-10-31 2015-01-27 Google Inc. System and method for capturing images of a geographic area
US20150144675A1 (en) * 2013-11-27 2015-05-28 Mine Safety Appliances Company Adjustable Lumbar Support for Mounting on a Backpack and Backpack Having the Same
US20160360865A1 (en) * 2015-06-14 2016-12-15 Shinji Marui Portable bag with adjustable inner container
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US20170231369A1 (en) * 2015-12-31 2017-08-17 The North Face Apparel Corp. Load-bearing systems
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US10004320B2 (en) 2016-05-10 2018-06-26 Amer Sports Canada Inc. Hipbelt suspension system for use with a backpack
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US10383427B1 (en) 2018-04-10 2019-08-20 Ralph Walker Backpack support device
US20190350347A1 (en) * 2018-05-15 2019-11-21 Samsonite Ip Holdings S.A R.L. Backpack with dynamic flexible hip belt
US20200113317A1 (en) * 2018-10-11 2020-04-16 Makita Corporation Backpack type device
US11039677B2 (en) * 2017-04-10 2021-06-22 Hewlett-Packard Development Company, L.P. Adjustable backpacks
US11246397B2 (en) 2018-08-23 2022-02-15 Phuong Nguyen Harness for golf bag
US11253047B1 (en) * 2018-08-22 2022-02-22 Hoverglide Inc. Suspended load backpack
US20230172344A1 (en) * 2021-12-06 2023-06-08 Graham Mark Armitage Backpack with shoulder straps crossing and non-fixed at top to support load from base
US11723831B2 (en) * 2019-04-16 2023-08-15 Li Zhijian Adjustable massage structure and massage backpack
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KR20170009289A (ko) * 2015-07-16 2017-01-25 현대자동차주식회사 리튬 이차전지용 난연성 전해액 및 이를 포함하는 리튬이차전지
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CN110345969B (zh) * 2019-06-28 2020-06-26 南京理工大学 基于运动感知的自控悬浮背架及最佳有效长度的获取方法
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FR3110826B1 (fr) 2020-05-28 2025-03-21 Blue Ice Europe Sac à dos comprenant une enveloppe externe indépendante de la poche principale
FR3122980B1 (fr) * 2021-05-21 2023-05-26 Brice Montessuit Dispositif de transport de charge équipé d’un dispositif de correction de posture
CN114234042B (zh) * 2021-12-01 2023-07-28 江苏明杰应急救援装备有限公司 一种减轻负担的可背负氧气瓶装置
KR102599180B1 (ko) * 2023-06-23 2023-11-07 (주)킴블스 군사용 배낭
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